Version 3.31.1
==============

* UI
 - Update primary menu layout according to app menu retirement initiative.
 - Refine controller preferences: hide sidebar while testing controllers
   and use better transitions.
 - Wrap plugin descriptions in preferences.
 - Remove double border on preferences sidebar.
 - Use HdyColumn to allow preferences dialog to get smaller.
 - Use HdyTitleBar in main and preferences windows.
 - Update development build style.

* Don't build MAME plugin by default. It can still be enabled via
  '-Dmame-plugin=true' build option.